质点做直线运动的v-t图像如图所示,则A.在前4s内质点做匀变速直线运动B.在1s~3S内质点做匀变速直线运动C.3S末质点的速度大小为5m/s,方向与规定的正方向相反D.2s~3s内与3s~4s内质点的速度方向相
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![质点做直线运动的v-t图像如图所示,则A.在前4s内质点做匀变速直线运动B.在1s~3S内质点做匀变速直线运动C.3S末质点的速度大小为5m/s,方向与规定的正方向相反D.2s~3s内与3s~4s内质点的速度方向相](/uploads/image/z/5085089-17-9.jpg?t=%E8%B4%A8%E7%82%B9%E5%81%9A%E7%9B%B4%E7%BA%BF%E8%BF%90%E5%8A%A8%E7%9A%84v-t%E5%9B%BE%E5%83%8F%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%88%99A.%E5%9C%A8%E5%89%8D4s%E5%86%85%E8%B4%A8%E7%82%B9%E5%81%9A%E5%8C%80%E5%8F%98%E9%80%9F%E7%9B%B4%E7%BA%BF%E8%BF%90%E5%8A%A8B.%E5%9C%A81s%7E3S%E5%86%85%E8%B4%A8%E7%82%B9%E5%81%9A%E5%8C%80%E5%8F%98%E9%80%9F%E7%9B%B4%E7%BA%BF%E8%BF%90%E5%8A%A8C.3S%E6%9C%AB%E8%B4%A8%E7%82%B9%E7%9A%84%E9%80%9F%E5%BA%A6%E5%A4%A7%E5%B0%8F%E4%B8%BA5m%2Fs%2C%E6%96%B9%E5%90%91%E4%B8%8E%E8%A7%84%E5%AE%9A%E7%9A%84%E6%AD%A3%E6%96%B9%E5%90%91%E7%9B%B8%E5%8F%8DD.2s%7E3s%E5%86%85%E4%B8%8E3s%7E4s%E5%86%85%E8%B4%A8%E7%82%B9%E7%9A%84%E9%80%9F%E5%BA%A6%E6%96%B9%E5%90%91%E7%9B%B8)
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